78920486 has 4 divisors (see below), whose sum is σ = 118380732. Its totient is φ = 39460242.

The previous prime is 78920453. The next prime is 78920489. The reversal of 78920486 is 68402987.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78920486² = 12456886220952392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78920489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19730120 + ... + 19730123.

It is an arithmetic number, because the mean of its divisors is an integer number (29595183).

Almost surely, 2^78920486 is an apocalyptic number.

78920486 is a deficient number, since it is larger than the sum of its proper divisors (39460246).

78920486 is a wasteful number, since it uses less digits than its factorization.

78920486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39460245.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 78920486 is about 8883.7202792524. The cubic root of 78920486 is about 428.9400357756.

The spelling of 78920486 in words is "seventy-eight million, nine hundred twenty thousand, four hundred eighty-six".